Some PLAFs display no JTable column headings if the first heading is blank

Name: gm110360 Date: 10/04/2001


J:\mscheper\7637\BIN>java -version
java version "1.3.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-b24)
Java HotSpot(TM) Client VM (build 1.3.1-b24, mixed mode)

When the leftmost column heading in a JTable is blank (i.e. getColumnHeading(0)
returns ""), the rendered table displays no column headings at all for some
pluggable looks and feelings (PLAFs).

This code demonstrates the problem:

---

import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.UIManager;
import java.awt.*;
import java.awt.event.*;

/**
 * Shows a {@link javax.swing.JTable JTable} bug.
 * <p>
 * This code is based on the version of <code>SimpleTableDemo</code> that is
available for download on
 * <a
href="http://java.sun.com/docs/books/tutorial/uiswing/components/table.html">Sun
's
 * "How to Use Tables"</a> web page. It has undergone the following
modifications:
 * <ol>
 * <li> The first column has a blank heading (the crux of the problem)
 * <li> The {@link #main} method has been modified to show tables using
 * different pluggable looks and feelings
 * </ol>
 *
 * @author Mik Scheper, <a href="http://www.iii.com/">Innovative Interfaces,
Inc.</a>
 */
public class SimpleTableDemo extends JFrame {
    private boolean DEBUG = true;

    public SimpleTableDemo(String sFrameTitle) {
        super(sFrameTitle);

        Object[][] data = {
            {"Mary", "Campione",
             "Snowboarding", new Integer(5), new Boolean(false)},
            {"Alison", "Huml",
             "Rowing", new Integer(3), new Boolean(true)},
            {"Kathy", "Walrath",
             "Chasing toddlers", new Integer(2), new Boolean(false)},
            {"Mark", "Andrews",
             "Speed reading", new Integer(20), new Boolean(true)},
            {"Angela", "Lih",
             "Teaching high school", new Integer(4), new Boolean(false)}
        };

        String[] columnNames = {"",
                                "Last Name",
                                "Sport",
                                "# of Years",
                                "Vegetarian"};

        final JTable table = new JTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));

        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
                }
            });
        }

        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this window.
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();

        System.out.println("Value of data: ");
        for (int i=0; i < numRows; i++) {
            System.out.print(" row " + i + ":");
            for (int j=0; j < numCols; j++) {
                System.out.print(" " + model.getValueAt(i, j));
            }
            System.out.println();
        }
        System.out.println("--------------------------");
    }

public static void main(String[] args)
{
SimpleTableDemo defaultPLAF = new SimpleTableDemo("default");
defaultPLAF.pack();
defaultPLAF.setVisible(true);

try
{
UIManager.setLookAndFeel
("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
}
catch (Exception oException)
{
oException.printStackTrace();
}
SimpleTableDemo motifPLAF = new SimpleTableDemo
("MotifLookAndFeel");
motifPLAF.pack();
motifPLAF.setLocation(new Point((int)(defaultPLAF.getLocation
().getX()+defaultPLAF.getSize().getWidth()), (int)(defaultPLAF.getLocation
().getY())));
motifPLAF.setVisible(true);

try
{
UIManager.setLookAndFeel
("javax.swing.plaf.metal.MetalLookAndFeel");
}
catch (Exception oException)
{
oException.printStackTrace();
}
SimpleTableDemo metalPLAF = new SimpleTableDemo
("WindowsLookAndFeel");
metalPLAF.pack();
metalPLAF.setLocation(new Point((int)(defaultPLAF.getLocation
().getX()), (int)(defaultPLAF.getLocation().getY()+defaultPLAF.getSize
().getHeight())));
metalPLAF.setVisible(true);

try
{
UIManager.setLookAndFeel
("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
catch (Exception oException)
{
oException.printStackTrace();
}
SimpleTableDemo windowsPLAF = new SimpleTableDemo
("MetalLookAndFeel");
windowsPLAF.pack();
windowsPLAF.setLocation(new Point((int)(defaultPLAF.getLocation
().getX()+defaultPLAF.getSize().getWidth()), (int)(defaultPLAF.getLocation
().getY()+defaultPLAF.getSize().getHeight())));
windowsPLAF.setVisible(true);
}
}
(Review ID: 133102)
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